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Presently PET/CT scan is the gold standard for malignancies generally.
Investigations have to be always correlated with the clinical conditions and other parameters. Physicians have to correlate everything with the presenting condition, clinico-radiologic and pathology investigations.
Internet gives you a whole lot of general, non-specific and sometimes inaccurate information causing unnecessary anxiety.
Specifically answering your query, PET scan is done along with CT scan and images are correlated with overlapping the images. So if there was lobular cancer, it would have shown up on CT at least.
Hope your concern is addressed.
Let me know if you have any other query.